I see in your photo you bottled some of Your brew into growlers... BE CAREFUL... growlers are designed to hold beer that has already been carbonated, not to be used to carbonate the beer in!

When carbonating beer, the Co2 builds up in the head space and then is slowly equalized and forced into solution over time. The presssure is greater than what growlers are designed for.

You may be fine, but you may have growler bombs!

Did you fill the growlers first or last? After you added your corn sugar prior to bottling did you stir the beer a few times during your bottling session?

I ask because the corn sugar usually doesn't stay mixed well, so you can get uneven distribution if you are not mixing a few times during bottling. Giving you some brews with WAY too much sugar resulting in higher carbonation levels and gushers or bottle bombs. And then others that are flat.

I've been brewing beer for 16 years. It's one of the coolest and most rewarding hobbies out there! Enjoy your journey! If you ever have any questions or want to research the craft- the beer advocate home Brewing forum is a great place!